Fibre-reactive monoazo dyestuffs

ABSTRACT

Fibre-reactive monoazo compounds of the formula ##STR1## which compounds are in free acid or salt form, and mixtures thereof, are useful for dyeing or printing hydroxy group- or nitrogen-containing organic substrates, for example leather and fibre material comprising natural or synthetic polyamides or natural or regenerated cellulose; the most preferred substrate is a textile material comprising cotton.

This is a continuation of application Ser. No. 08/431,653, filed May 2, 1995, now abandoned, which in turn is a continuation of application Ser. No. 08/121,716, filed Sep. 15, 1993, now abandoned.

This invention relates to fibre-reactive monoazo compounds and processes for their production. These compounds are suitable for use as fibre-reactive dyestuffs in any conventional dyeing or printing processes.

More particularly, the invention provides compounds of formula I ##STR2## and salts thereof, or a mixture of such compounds or salts, in which each R₁ is independently hydrogen, C₁₋₄ alkyl or substituted

C₁₋₄ alkyl,

D is one of the radicals (a) to (f), ##STR3## in which R₂ is hydrogen, C₁₋₄ alkyl or C₁₋₄ alkoxy,

R₃ is hydrogen, C₁₋₄ alkyl, carboxy or --O--A--₁ --OR₄,

A₁ is C₂₋₄ alkylene,

R₄ is hydrogen, sulpho, C₁₋₄ alkyl or C₂₋₄ hydroxyalkyl,

R₅ is C₂₋₄ alkyl,

R₆ is hydrogen or sulpho, and

each R₇ is independently hydrogen, C₁₋₄ alkyl, C₁₋₄ alkoxy or carboxy;

each p is 0, 1 or 2,

q is 1 or 2,

r is 1, 2 or 3, and

each t is 0 or 1;

each of Z and Z_(d) is independently (z₁), (z₂) or (z₃), ##STR4## in which T₁ is hydrogen, chloro or cyano,

the two T₂ 's are the same and each T₂ is fluoro or chloro,

Hal is fluoro or chloro, and

    W.sub.1 is --NR.sub.1 --B.sub.1 --NR.sub.1 --, ##STR5## wherein each m is independently 0 or 1 and the marked nitrogen atom is bound to a carbon atom of the triazine ring,

B₁ is C₂₋₄ alkylene; --C₂₋₃ alkylene-Q--C₂₋₃ alkylene- in which Q is --O-- or --NR₁ --; C₃₋₄ alkylene monosubstituted by hydroxy, ##STR6## in which n is 0 or an integer 1 to 4,

R₈ is hydrogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, carboxy or sulpho, and the marked carbon atom is attached to the --NR₁ group which is bound to a carbon atom of the triazine ring;

with the provisos that

(i) ##STR7## when D is a radical (a) or (c); (ii) Z is (z₁) or (z₂), when D is a radical (b); and

(iii) each of Z and Z₁ is independently (z₂) or (z₃), when D is a radical (d), (e) or (f), and at least one of Z and ##STR8##

In the specification, any alkyl, alkoxy or alkylene group present is linear or branched unless indicated otherwise. In any hydroxysubstituted alkyl or alkylene group which is attached to a nitrogen atom, the hydroxy group is preferably bound to a carbon atom which is not directly attached to the nitrogen atom. In any alkylene chain interrupted by Q which is attached to a nitrogen atom, Q is preferably bound to a carbon atom which is not directly attached to the nitrogen atom.

When R₁ is a substituted alkyl group, it is preferably monosubstituted by hydroxy, cyano or chloro.

Each R₁ is preferably R_(1a), where each R_(1a) is independently hydrogen, methyl, ethyl or 2-hydroxyethyl; more preferably each R₁ is R_(1b), where each R_(1b) is independently hydrogen or methyl. Most preferably each R₁ is hydrogen.

R₂ is preferably R_(2a), where R_(2a) is hydrogen, methyl or methoxy.

A₁ is preferably A₁, where A₁ ' is C₂₋₃ alkylene.

R₄ is preferably R_(4a), where R_(4a) is hydrogen, sulpho, methyl, ethyl or C₂₋₃ hydroxyalkyl. More preferably, R₄ is R_(4b), where R4b is hydrogen, sulpho or 2-hydroxyethyl.

R₃ is preferably R_(3a), where R_(3a) is hydrogen, methyl, carboxy or --O--A₁ '--OR_(4a) ; more preferably it is R_(3b) where R_(3b) is hydrogen, methyl or --O--A₁ '--OR_(4b).

R₅ is preferably R_(5a), where R_(5a) is C₂₋₃ alkyl; most preferably R₅ is ethyl.

R₆ is preferably hydrogen.

Each R₇ is preferably R_(7a), where each R_(7a) is independently hydrogen, methyl or methoxy.

Hal is most preferably chlorine.

R₈ is preferably R_(8a), where R_(8a) is hydrogen, methyl, methoxy, carboxy or sulpho; more preferably it is R_(8b), where R_(8b) is hydrogen or sulpho.

B₁ is preferably B_(1a), where B_(1a), is C₂₋₃ alkylene, --CH₂ CH₂ --O--CH₂ CH₂ --, --CH₂ CH₂ --NR_(1a) --CH₂ CH₂ --, monohydroxy-substituted C₃₋₄ alkylene, ##STR9## in which n' is 0 or 1. B₁ is more preferably B_(1b), where B_(1b) is C₂₋₃ alkylene, --CH₂ CH₂ --N_(1b) --CH₂ CH₂ --, --CH₂ CH(OH)CH₂ -- or ##STR10##

B₁ is most preferably B_(1c), where B_(1c) is --CH₂ CH₂ --, --CH₂ CH₂ CH₂ --, --*CH₂ CH(CH₃)-- or --CH₂ CH(OH)CH₂ --, in which the marked carbon atom is bound to the --NR₁ group which is attached to a carbon atom of the triazine ring.

W₁ is preferably W_(1a), where W_(1a) is --NR_(1a) --B_(1a) --NR_(1a) --, ##STR11## more preferably it is W_(1b), where W_(1b) is --NR_(1b) --B_(1b) --NR_(1b) -- or ##STR12## most preferably W₁ is W_(1c), where W_(1c) is --NH--B_(1c) --NH--.

(z₂) is preferably (z₂ ') or (z₂ ") of the formulae ##STR13## in which T₁ ' is hydrogen or chloro.

(z₃) is preferably (z₃ ') of the formula ##STR14## in which Z₁ is a radical (z₂); more preferably it is (z₃ ") of the formula ##STR15## in which Z₁ ' is a radical (z₂ ') or (z₂ "). (a) is preferably (a') of the formula ##STR16## more preferably, R_(3a) in (a') is R_(3b) ; (b) is preferably (b') of the formula ##STR17## in which R_(5a) is most preferably ethyl; (c) is preferably (c') of the formula ##STR18## in which r' is 2 or 3; (d) is preferably (d') of the formula, ##STR19## in which the radical --(CH₂)_(t) --NR_(1b) --Z_(d) ' is in the meta- or para-position to the azo group,

(e) is preferably (e') of the formula, ##STR20## and (f) is preferably (f') of the formula, ##STR21## in which the radical --(CH₂)_(t) --NR_(1b) --Z_(d) ' is in the meta- or para-position to --O--,

in which radicals (d') to (f') Z_(d) ' is a radical (z₂) or (z₃ '). Most preferably, Z_(d) ' in a radical (d'), (e') or (f') is Z_(d) ", where Z_(d) " is a radical (z₂ '), (z₂ ") or (z₃ ").

Preferred compounds of formula I correspond to formulae Ia, Ib and Ic, and salts thereof, ##STR22## in which D_(a) is a radical (a') or (c'). More preferred are compounds of formula Ia, in which in (a') R₃ a is R_(3b) ; ##STR23## in which Z_(b) is a radical (z₁) or (z₂), and the radical --NR_(1a) --Z_(b) is in the 2- or 3-position of the naphthyl ring. More preferred are compounds of formula Ib in which

(1) R_(1a) is R_(1b) ;

(2) those of (1) in which R_(1b) is hydrogen;

(3) R_(5a) is ethyl;

(4) those of (1) to (3) in which the radical --NR_(1a) --Z_(b) is in the 3-position of the naphthyl ring;

(5) those of (1) to (4) in which ##STR24## in which D_(c) is a radical (d'), (e') or (f') and Z_(c) is (z₂) or (z₃ '); with the proviso that at least one of Z_(d) ' and ##STR25## More preferred are compounds of formula Ic in which (1) R_(1b) is hydrogen;

(2) Z_(c) is Z_(c) ' where Z_(c) ' is a radical (z₂ '), (z₂ ") or (z₃ ");

(3) Z_(d) ' in (d') (e') and (f') is Z_(d) ";

(4) one of Z_(d) ' and ##STR26## and the other is a radical (z₃ '); (5) those of (4) in which (z₃ ') is (z₃ ").

When a compound of formula I is in salt form, the cation associated with the sulpho groups and any carboxy group is not critical and may be any one of those non-chromophoric cations conventional in the field of fibre-reactive dyes provided that the corresponding salts are water-soluble. Examples of such cations are alkali metal cations and unsubstituted and substituted ammonium cations, e.g., lithium, sodium, potassium, ammonium, mono-, di-, tri- and tetra-methylammonium, tri-ethylammonium and mono-, di- and tri- ethanolammonium.

The preferred cations are the alkali metal cations and ammonium, with sodium being the most preferred.

In a compound of formula I the cations of the sulpho and any carboxy groups can be the same or different, e.g., they can also be a mixture of the above mentioned cations meaning that the compound of formula I can be in a mixed salt form.

The invention further provides a process for the preparation of compounds according to formula I or mixtures thereof, comprising reacting the diazonium salt of an amine of formula II,

    D--NH.sub.2                                                II

in which D is as defined above, with a compound of formula III ##STR27## in which R₁ is as defined above, and X is hydrogen or a radical Z, and in case where X is hydrogen, subsequently reacting the coupling product obtained with a compound of formula Z-Hal in which Hal is fluoro or chloro.

Compounds of formula I in which D is a radical (d), (e) or (f), and Z and Z_(d) are both ##STR28## may also be prepared by reacting 1 mole of a compound of formula IV, ##STR29## in which R₁ is as defined above, and D' is a radical ##STR30## with at least two moles of 2,4,6-trifluoropyrimidine.

Diazotisation and coupling may be carried out in accordance with conventional methods; the coupling reaction is preferably carried out in a pH range of from 6.5-8.5, especially at pH 7-8.

The condensation of an amino group with a compound of formula Z-Hal (including 2,4,6-trifluoropyrimidine) is suitably carried out at a slightly elevated temperature in the range of from 35°-60° C., and at a pH of 4-6.

The compounds of formula I may be isolated in accordance with known methods, for example, by conventional salting out with alkali metal salt, filtering and drying optionally in vacuo and at slightly elevated temperatures.

Depending on the reaction and isolation conditions a compound of formula I is obtained in free acid or preferably salt form or even mixed salt form containing, for example, one or more of the above mentioned cations. It may be converted from free acid form to a salt form or mixture of salt forms or vice versa or from one salt form to another by conventional means.

It should be noted that any group Z or Z_(d) which is a monofluoropyrimidinyl radical or a radical (z2) corresponding to the formulae ##STR31## can occur in two isomeric forms, with the floating fluoro or chloro substituent in either the 2- or the 6-position.

In general, it is preferred to use this mixture of resulting dyestuffs as it is without resorting to the isolation of a single isomer for use, but should this be desired it can be readily achieved by conventional methods.

The starting compounds of the formulae II, III and IV and also Z-Hal are either known or may be readily made from known starting materials by known methods using conventional diazotising, coupling and/or condensation reactions.

The compounds of formula I and mixtures thereof are useful as fibre-reactive dyestuffs for dyeing or printing hydroxy group- or nitrogen-containing organic substrates. Preferred substrates are leather and fibre material comprising natural or synthetic polyamides and, particularly, natural or regenerated cellulose such as cotton, viscose and spun rayon. The most preferred substrate is textile material comprising cotton.

Dyeing or printing is effected in accordance with known methods conventional in the fibre-reactive dyestuff field. Preferably, for the compounds of formula I the exhaust dyeing method is used at temperatures within the range of 30° to 80° C., particularly at 50°-60° C., whereby a liquor to goods ratio of 6:1 to 30:1 is used and more preferably of 10:1 to 20:1.

The compounds of this invention have goqd compatibility with known fibre-reactive dyes; they may be applied alone or in combination with appropriate fibre-reactive dyestuffs of the same class having analogous dyeing properties such as common fastness properties and the extent of ability to exhaust from the dyebath onto the fibre. The dyeings obtained with such combination mixtures have good fastness properties and are comparable to those obtained with a single dyestuff.

The compounds of formula I give good exhaust and fixation yields when used as dyestuffs. Moreover, any unfixed compound is easily washed off the substrate. The dyeings and prints derived from the compounds of formula I exhibit good light fastness and good wet fastness properties such as wash, water, sea water and sweat fastness. They also exhibit good resistance to oxidation agents such as chlorinated water, hypochlorite bleach, peroxide bleach and perborate-containing washing detergents.

The following examples illustrate the invention. In the examples all parts and percentages are by weight unless indicated to the contrary, and all temperatures are given in degrees Centigrade.

EXAMPLE 1

47.8 Parts of 2-amino-5-hydroxynaphthalene-7-sulphonic acid are suspended in 500 parts of water at 25° and are dissolved by adding 30% sodium hydroxide solution. To the resultant solution, 19.4 parts of 2,4,6-trifluoropyrimidine are added. The pH of the reaction mixture is kept at 4.4-4.8 by adding 20% sodium carbonate solution continuously, and the temperature is simultaneously increased to 40°-45° . Stirring is effected until the reaction is complete whereby from time to time the course of the reaction is monitored by thin layer chromatography.

The suspension thus obtained is added all at once at 0°-5° to a diazonium salt solution which has been prepared in a conventional manner from 43.4 parts of 3-amino-4-methoxy-5-methylbenzene sulphonic acid. The pH of the reaction mixture is kept at 7.2-7.5 by the addition of 20% sodium carbonate solution. After the coupling reaction is completed, the formed dyestuff is salted out with sodium chlqride, filtered off and dried at 50° in vacuo. The dyestuff corresponds to the formula (shown in free acid form), ##STR32## it dyes cotton in orange shades. These cotton dyeings exhibit good light and wet fastness properties and are resistant to oxidative influences.

EXAMPLE 2

28.1 Parts of 2-acetylamino-5-hydroxynaphthalene-7-sulphonic acid are dissolved in 200 parts of water at 25°. To this solution a diazonium salt solution is added at 0°-5° which has been prepared in a conventional manner from 26.0 parts of 1-acetylamino-3-amino-4-methoxybenzene-5-sulphonic acid. The pH of this coupling mixture is held at 8.0-8.5 by the addition of 20% sodium carbonate solution. After the reaction is complete, the azo dyestuff thus obtained is salted out by adding sodium chloride and filtered with suction.

The moist filter residue is dissolved in 300 parts by volume of 4% sodium hydroxide solution. The solution is refluxed at 90°-100° until the saponification of the acetamido groups is complete (which has to be monitored by thin layer chromatography). The reaction mixture is then cooled to 20° and the pH is adjusted to 4.3-4.8 by adding 30% hydrochloric acid. Subsequently, 26.8 parts of 2,4,6-trifluoropyrimidine are added. The pH of the mixture is kept at 4.3-4.8 by the continuous addition of 20% sodium carbonate solution, and the temperature is increased to 40°-45°. After the reaction is complete, the dyestuff is salted out by adding sodium chloride, filtered and dried at 50° in vacuo. It corresponds to the formula (shown in free acid form) ##STR33##

With this dyestuff scarlet dyeings and prints on contton are obtained which show excellent properties with respect to light fastness and wet fastness and are resistant to oxidative influences.

EXAMPLES 3 TO 96

By analogy with the method described in Example 1 or 2, using appropriate starting compounds, further compounds of formula I may be prepared which are listed in the following Tables 1 to 4. They correspond to the formulae (T1), (T2), (T3) and (T4) as follows: ##STR34## for Table 1; ##STR35## for Table 2; ##STR36## for Table 3; and ##STR37## for Table 4 in which the symbols are as defined in Tables 1 to 4.

The compounds of Examples 3 to 96 may be applied to substrates which comprise cellulose fibres, and particularly to textile material comprising cotton using the conventional exhaust dyeing method or conventional printing processes, where dyeings or prints in orange to scarlet shades are obtained. These dyeings and prints on cotton show good properties with respect to light fastness and wet fastnesses and are resistant to oxidative influences.

                                      TABLE 1                                      __________________________________________________________________________     Compounds of formula (T1)                                                      Examples 3-27                                                                  Ex. No.                                                                            DT.sub.1          position of NR.sub.1                                                                     R.sub.1                                        __________________________________________________________________________          ##STR38##        3         H                                              4                                                                                   ##STR39##        3         CH.sub.3                                       5                                                                                   ##STR40##        3         H                                              6   "                 2         H                                              7                                                                                   ##STR41##        3         H                                              8   "                 3         CH.sub.3                                       9                                                                                   ##STR42##        3         H                                              10  "                 2         H                                              11                                                                                  ##STR43##        2         H                                              12  "                 3         H                                              13  "                 3         CH.sub.2 CH.sub.3                              14                                                                                  ##STR44##        3         H                                              15  "                 2         H                                              16                                                                                  ##STR45##        3         H                                              17  "                 3         CH.sub.3                                       18                                                                                  ##STR46##        3         "                                              19  "                 2         H                                              20                                                                                  ##STR47##        3         H                                              21  "                 2         H                                              22                                                                                  ##STR48##        3         H                                              23  "                 3         CH.sub.3                                       24                                                                                  ##STR49##        3         H                                              25  "                 3         CH.sub.3                                       26                                                                                  ##STR50##        3         H                                              27  "                 2         H                                              __________________________________________________________________________

In Tables 2 to 4 below, the following symbols ZT_(a), ZT_(b) and ZT_(c) are used for ZT₂, Z_(d) and Z_(k) and ZT₄, where ##STR51##

Furthermore, in Table 2 below each marked carbon atom in the column under DT₂ is bound to the azo group in formula (T2); and each marked nitrogen atom in the column under --W₁ -- is bound to a carbon atom of the triazine ring in formula (T2).

                                      TABLE 2                                      __________________________________________________________________________     Compounds of formula (T2)                                                      Examples 28-53                                                                 Ex. No.                                                                            DT.sub.2   position of NR.sub.1                                                                     R.sub.1                                                                           Hal                                                                               W.sub.1    ZT.sub.2                             __________________________________________________________________________     28                                                                                  ##STR52## 3         H  Cl NHCH.sub.2 CH.sub.2 CH.sub.2 NH                                                           ZT.sub.a                             29  "          3         H  F  "          "                                    30  "          3         H  Cl "          ZT.sub.b                             31  "          3         H  Cl                                                                                 ##STR53## ZT.sub.a                             32  "          3         H  Cl                                                                                 ##STR54## "                                    33  "          2         H  Cl "          ZT.sub.b                             34  "          3         CH.sub.3                                                                          Cl                                                                                 ##STR55## ZT.sub.a                             35                                                                                  ##STR56## 3         H  Cl "          "                                    36  "          3         H  F  NHCH.sub.2 CH.sub.2 CH.sub.2 NH                                                           "                                    37  "          2         H  Cl "          ZT.sub.c                             38  "          3         H  Cl                                                                                 ##STR57## ZT.sub.a                             39  "          3         H  Cl "          ZT.sub.b                             40  "          3         H  Cl                                                                                 ##STR58## ZT.sub.a                             41                                                                                  ##STR59## 3         H  Cl "          "                                    42  "          2         CH.sub.3                                                                          Cl                                                                                 ##STR60## "                                    43  "          3         H  Cl "          ZT.sub.b                             44  "          3         H  Cl                                                                                 ##STR61## ZT.sub.a                             45  "          3         H  Cl NHCH.sub.2 CH.sub.2 CH.sub.2 NH                                                           "                                    46  "          2         H  Cl "          ZT.sub.c                             47                                                                                  ##STR62## 3         H  Cl                                                                                 ##STR63## ZT.sub.a                             48  "          3         CH.sub.3                                                                          Cl "          ZT.sub.c                             49                                                                                  ##STR64## 3         H  Cl NHCH.sub.2 CH.sub.2 CH.sub.2 NH                                                           ZT.sub.a                             50  "          3         H  F  "          ZT.sub.b                             51  "          3         H  Cl                                                                                 ##STR65## ZT.sub.a                             52  "          2         H  Cl "          "                                    53  "          3         H  Cl                                                                                 ##STR66## ZT.sub.c                             __________________________________________________________________________

In Table 3 below each marked carbon atom in the column under DT₃ is bound to the azo group in formula (T3).

                                      TABLE 3                                      __________________________________________________________________________     Compounds of formula (T3)                                                      Examples 54-73                                                                 Ex. No.                                                                            Z.sub.d                                                                           DT.sub.3           position of NR.sub.1                                                                     R.sub.1                                                                           Z.sub.k                                 __________________________________________________________________________     54  ZT.sub.a                                                                           ##STR67##         2         H  ZT.sub.a                                55  ZT.sub.b                                                                          "                  3         H  "                                       56  ZT.sub.a                                                                          "                  3         CH.sub.3                                                                          ZT.sub.c                                57  "  "                  3         "  ZT.sub.a                                58  ZT.sub.a                                                                           ##STR68##         3         H  ZT.sub.a                                59  "  "                  3         CH.sub.3                                                                          "                                       60  "  "                  3         H  ZT.sub.b                                61  ZT.sub.b                                                                          "                  2         H  ZT.sub.a                                62  ZT.sub.a                                                                           ##STR69##         3         H  "                                       63  ZT.sub.b                                                                          "                  3         CH.sub.3                                                                          "                                       64  ZT.sub.c                                                                          "                  2         H  "                                       65  ZT.sub.a                                                                           ##STR70##         3         H  "                                       66  "                                                                                  ##STR71##         2         H  "                                       67  "  "                  3         H  ZT.sub.b                                68  ZT.sub.a                                                                           ##STR72##         3         H  ZT.sub.a                                69  ZT.sub.b                                                                          "                  3         CH.sub.3                                                                          "                                       70  ZT.sub.a                                                                           ##STR73##         3         H  ZT.sub.a                                71  "  "                  3         CH.sub.3                                                                          "                                       72  "                                                                                  ##STR74##         2         H  "                                       73  "  "                  3         H  ZT.sub.2                                __________________________________________________________________________

In Table 4 below each marked carbon atom in the column under DT₄ is bound to the azo group in formula (T4); and each marked nitrogen atom in the column under --W₁ -- is bound to a carbon atom of the triazine ring in formula (T4).

                                      TABLE 4                                      __________________________________________________________________________     Compounds of formula (T4)                                                      Examples 74-96                                                                 Ex. No.                                                                            DT.sub.4        Hal                                                                               W.sub.1    ZT.sub.4                                                                          position of NR.sub.1                                                                     R.sub.1                         __________________________________________________________________________     74                                                                                  ##STR75##      Cl                                                                                 ##STR76## ZT.sub.a                                                                          3         H                               75  "               Cl "          ZT.sub.b                                                                          2         H                               76  "               Cl                                                                                 ##STR77## ZT.sub.a                                                                          3         CH.sub.3                        77  "               Cl                                                                                 ##STR78## "  3         H                               78                                                                                  ##STR79##      Cl                                                                                 ##STR80## ZT.sub.a                                                                          3         CH.sub.3                        79  "               F  "          ZT.sub.c                                                                          3         H                               80                                                                                  ##STR81##      Cl NHCH.sub.2 CH.sub.2 CH.sub.2 NH                                                           ZTa                                                                               3         H                               81  "               Cl "          ZT.sub.b                                                                          2         H                               82  "               Cl                                                                                 ##STR82## ZT.sub.c                                                                          3         H                               83  "               Cl "          ZT.sub.a                                                                          3         H                               84  "               Cl                                                                                 ##STR83## "  3         H                               85  "               F  "          "  3         H                               86  "               Cl                                                                                 ##STR84## "  3         H                               87  "               Cl "          ZT.sub.b                                                                          3         H                               88                                                                                  ##STR85##      Cl                                                                                 ##STR86## ZT.sub.a                                                                          3         H                               89  "               Cl                                                                                 ##STR87## "  3         CH.sub.3                        90  "               Cl "          "  2         H                               91  "               Cl                                                                                 ##STR88## ZT.sub.c                                                                          3         H                               92  "               Cl "          ZT.sub.b                                                                          2         H                               93                                                                                  ##STR89##      Cl                                                                                 ##STR90## ZT.sub.a                                                                          3         H                               94  "               Cl                                                                                 ##STR91## ZT.sub.b                                                                          3         H                               95                                                                                  ##STR92##      Cl "          ZT.sub.a                                                                          3         H                               96  "               Cl                                                                                 ##STR93## ZT.sub.c                                                                          2         H                               __________________________________________________________________________

EXAMPLE 97

47.8 Parts of 2-amino-5-hydroxynaphthalene-7-sulphonic acid are reacted with 19.4 parts of 2,4,6-trifluoropyrimidine in accordance with the method described in the first step of Example 1.

The suspension thus obtained is added all at once at 0°-50° to a diazonium salt solution which has been prepared in a conventional manner from 43.4 parts of 2-amino-5-ethoxybenzene sulphonic acid. The pH of the reaction mixture is kept at 7.0-7.5 by the addition of 15% sodium carbonate solution. After coupling is complete, the resultant dyestuff is salted out by the addition of sodium chloride, filtered and dried in vacuo at 50°. The dyestuff has the formula (shown in free acid form) ##STR94## and dyes cotton a scarlet-red shade. These cotton dyeings show good light- and wet-fastness properties and are resistant to oxidative influences.

EXAMPLES 98 TO 108

By analogy with the method described in Example 97, using appropriate starting compounds, further compounds of formula I may be prepared which are listed in Table 5 below. They correspond to the formula (T5) ##STR95## in which the symbols are as defined in Table 5.

In Table 5, in addition to ZT_(a) which is as defined above, the following symbols ZT_(d) and ZT_(e) are used where ##STR96##

The compounds of Examples 98 to 108 may be applied to substrates which comprise cellulose fibres, and particularly to textile material comprising cotton using the conventional exhaust dyeing method or conventional tional printing processes, where dyeings or prints in orange to scarlet-red shades are obtained. These dyeings and prints on cotton show good light- and wet-fastness properties and are resistant to oxidative influences.

                  TABLE 5                                                          ______________________________________                                         Compounds of formula (T5)                                                      Examples 98 to 108                                                                                            position                                        Ex.No.                                                                               RT.sub.5          R.sub.1                                                                               of --NR.sub.1 --                                                                       ZT.sub.5                                ______________________________________                                         98    --CH.sub.2 CH.sub.3                                                                              CH.sub.3                                                                              3       ZT.sub.a                                99    "                 H      2       "                                       100   "                 H      3       ZT.sub.d                                101   "                 CH.sub.3                                                                              2       ZT.sub.a                                102   "                 "      3       ZT.sub.d                                103   "                 H      3       ZT.sub.e                                104   --CH.sub.2 CH.sub.2 OH                                                                           H      2       ZT.sub.a                                105   --CH.sub.2 CH.sub.2 OSO.sub.3 H                                                                  CH.sub.3                                                                              3       "                                       106   "                 H      2       "                                       107   --CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 OH                                                        H      3       "                                       108   "                 H      2       "                                       ______________________________________                                    

By the preparation method described in Example 1, 2 or 97, the compounds of Examples 1-108 are obtained in their sodium salt form. By changing the reaction or isolation conditions or by using other known methods, it is possible to produce the compounds in the form of free acid or in other salt forms or mixed salt forms which contain one or more of the cations mentioned hereinabove.

As already mentioned hereinbefore in the description, the exemplified dyestuffs (and the corresponding free acids and other salt forms) contain two isomefic compounds regarding the radical ##STR97## one compound in which the floating fluoro substituent on the pyrimidine ring is in the 2-position and the corresponding compound wherein it is in the 6-position. In an analogous manner the radicals ZT_(b), ZT_(c) and ZT_(e) are also present in two appropriate isomeric forms with respect to the floating chloro or fluoro substituent. The obtained mixtures of isomeric dyestuffs may be used in conventional dyeing or printing processes; the isolation of a single isomer for use normally is unnecessary.

In the following examples, the application of the compounds of this invention is illustrated.

APPLICATION EXAMPLE A

0.3 Part of the dyestuff of Example 1 is dissolved in 100 parts of demineralised water and 8 parts of Glauber's salt (calcined) are added. The dyebath is heated to 50°, then 10 parts of cotton fabric (bleached) are added. After 30 minutes at 50°, 0.4 part of sodium carbonate (calcined) is added to the bath. During the addition of sodium carbonate the temperature is kept at 50°. Subsequently, the dyebath is heated to 60°, and dyeing is effected for a further one hour at 60°.

The dyed fabric is then rinsed with running cold water for 3 minutes and afterwards with running hot water for a further 3 minutes. The dyeing is washed at the boil for 15 minutes in 500 parts of demineralised water in the presence of 0.25 part of Marseille soaps. After being rinsed with running hot water (for 3 minutes) and centrifuged, the dyeing is dried in a cabinet dryer at about 70°. A deep-orange cotton dyeing is obtained showing good fastness properties, and particularly high light- and wet-fastness properties, which is stable towards offdative influences.

APPLICATION EXAMPLE B

To a dyebath containing in 100 parts of demineralised water 5 parts of Glauber's salt (calcined), 10 parts of cotton fabric (bleached) are added. The bath is heated to 50° within 10 minutes, and 0.5 part of the dyestuff of Example 1 is added. After a further 30 minutes at 50°, 1 part of sodium carbonate (calcined) is added. The dyebath is then heated to 60° and dyeing is continued at 60° for a further 45 minutes.

The dyed fabric is rinsed with running cold and then hot water and washed at the boil according to the method given in Application Example A. After rinsing and drying a deep-orange cotton dyeing is obtained which has the same good fastness properties as indicated in Application Example A.

Similarly, the dyestuffs of Examples 2-108 or mixtures of the exemplified dyestuffs may be employed to dye cotton in accordance with the method described in Application Example A or B. The cotton dyeings thus obtained are orange to scarlet and show good fastness properties.

APPLICATION EXAMPLE C

    ______________________________________                                         A printing paste consisting of                                                 ______________________________________                                          40 parts of the dyestuff of Example 1                                          100 parts of urea                                                              350 parts of water                                                             500 parts of a 4% sodium alginate thickener and                                10 parts of sodium bicarbonate                                                1000 parts in all                                                              ______________________________________                                    

is applied to cotton fabric in accordance with conventional printing methods.

The printed fabric is dried and fixed in steam at 102°-104° for 4-8 minutes. It is rinsed in cold and then hot water, washed at the boil (according to the method described in Application Example A) and dried. An orange print is obtained which has good general fastness properties.

Similarly, the dyestuffs of Examples 2 to 108 or mixtures of the exemplified dyestuffs may be employed to print cotton in accordance with the method given in Application Example C. All prints obtained are orange to scarlet and show good fastness properties. 

What is claimed is:
 1. A compound of formula I ##STR98## or a salt thereof, or a mixture of such compounds or salts, in which each R₁ is independently hydrogen, C₁₋₄ alkyl or substituted C₁₋₄ alkyl monosubstituted with a group selected from hydroxy, cyano, or chloroD is one of the radicals (a) to (f), ##STR99## in which R₂ is hydrogen, or C₁₋₄ alkyl, R₃ is hydrogen, C₁₋₄ alkyl, carboxy or --O--A₁ --OR₄, A₁ is C₂₋₄ alkylene, R₄ is hydrogen, sulpho, C₁₋₄ alkyl or C₂₋₄ hydroxyalkyl, R₅ is C₂₋₄ alkyl, R₆ is hydrogen or sulpho, andeach R₇ is independently hydrogen, C₁₋₄ alkyl, C₁₋₄ alkoxy or carboxy; each p is 0, 1 or 2, q is 1 or 2, r is 1, 2 or 3, and each t is 0 or 1; each of Z and Z₄ is independently (z₁), (z₂) or (z₃), ##STR100## in which T₁ is hydrogen, or cyano, the two T₂ 's are the same and each T₂ is fluoro or chloro, Hal is fluoro or chloro, and

    W.sub.1 is --NR.sub.1 --B.sub.1 --NR.sub.1 -- ##STR101## wherein each m is independently 0 or 1 and the marked nitrogen atom is bound to a carbon atom of the triazine ring,

B₁ is C₂₋₄ alkylene; --C₂₋₃ alkylene--Q--C₂₋₃ alkylene-- in which Q is --O-- or --NR₁ --; C₃₋₄ alkylene monosubstituted by hydroxy, ##STR102## in which n is 0 or an integer 1 to 4, R₈ is hydrogen, C₁₋₄ alkyl, C₁₋₄ alkoxy, carboxy or sulpho, and the marked carbon atom is attached to the --NR₁ group which is bound to a carbon atom of the triazine ring;with the provisos that (i) ##STR103## when D is a radical (a) or (c); (ii) Z is (z₁) or (z₂), when D is a radical (b); and (iii) each of Z and Z_(d) is independently (z₂) or (z₃), when D is a radical (d), (e) or (f), and at least one of Z and Z_(d) is ##STR104##
 2. A compound according to claim 1, in which each R₁ is R_(1a), where each R_(1a) is independently hydrogen, methyl, ethyl or 2-hydroxyethyl.
 3. A compound according to claim 1, which corresponds to formula Ia, ##STR105## or a salt thereof, in which D_(a) is a radical (a') or (c'), ##STR106## in which R_(2a) is hydrogen or methyl,R_(3a) is hydrogen, methyl, carboxy or --O--A₁ '--OR_(4a),wherein A₁ ' C₂₋₃ -alkylene and R_(4a) is hydrogen, sulpho, methyl, ethyl or C₂₋₃ hydroxyalkyl; q is 1 or 2, and r' is 2 or
 3. 4. A compound according to claim 1, which corresponds to formula Ic, ##STR107## or a salt thereof, in which D_(c) is a radical (d'), (e') or (f'), ##STR108## wherein R_(7a) is hydrogen, methyl or methoxy,m is 0 or 1, t is 0 or 1, and the radical --(CH₂)_(t) --NR_(1b) --Z_(d) ' in (d') is in the meta- or para-position to the azo group, and that in (f') is in the meta- or para-position to --O--; each R_(1b) is independently hydrogen or methyl, each of Z_(c) and Z_(d) ' is independently a radical (z₂) or (z₃ '), where(z₂) is as defined in claim 1 and (z₃ ') is of the formula ##STR109## wherein Z₁ is a radical (z₂), and W_(1b) is --NR_(1b) --B_(1b) --NR_(1b) -- or ##STR110## in which B_(1b) is C₂₋₃ alkylene, --CH₂ CH₂ --NR_(1b) --CH₂ CH₂ --, ##STR111## and R_(8b) is hydrogen or sulpho, with the proviso that at least one of Z_(c) and ##STR112##
 5. A compound according to claim 4, in which R_(1b) is hydrogen.
 6. A compound according to claim 4, in which Z_(c) is Z_(c) ' and Z_(d) ' in (d'), (e') and (f') is Z_(d) ", where each of Z_(c) ' and Z_(d) " is a radical (z₂ '), (z₂ ") or (z₃ ") ##STR113## in which T₁ ' is hydrogen or chloro,W_(1c) is --NH--B_(1c) --NH-- wherein B_(1c) is --CH₂ CH₂ --, --CH₂ CH₂ CH₂ --, --*CH₂ CH(CH₃)-- or --CH₂ CH(OH)CH₂ --, in which the marked carbon atom is bound to the --NR₁ group which is attached to a carbon atom of the triazine ring, and Z₁ ' is a radical (z₂ ') or (z₂ ").
 7. A compound according to claim 4, in which one of Z_(c) and ##STR114## and the other is a radical (z₃ ').
 8. A compound according to claim 7, in which (z₃ ') is a radical (z₃ ") ##STR115## in which W_(1c) is --NH--B_(1c) --NH-- wherein B_(1c) is --CH₂ CH₂ --, --CH₂ CH₂ CH₂ --, --*CH₂ CH(CH₃)-- or --CH₂ CH(OH)CH₂ --, in which the marked carbon atom is bound to the --NR₁ group which is attached to a carbon atom of the triazine ring, andZ₁ ' is a radical (z₂ ') or (z₂ ") ##STR116## wherein T₁ " is hydrogen or chloro.
 9. A process for dyeing or printing a hydroxy group- or nitrogen-containing organic substrate comprising applying to the substrate a compound according to claim 1, or a mixture thereof.
 10. A process according to claim 9, wherein the substrate is a fibre material comprising natural or regenerated cellulose.
 11. A compound of claim 1 wherein Z is (z₂) or (z₃). 